fix(javascript): bun setup for javascript workflows

[abdsahin]

Bun added as a package manager but the workflows are still using NodeJS. This is to fix this.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.74359% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 96.34%. Comparing base (f41cf3c) to head (a5d3488).
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/cdk/jsii-project.ts	20.00%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3176      +/-   ##
==========================================
+ Coverage   96.32%   96.34%   +0.02%     
==========================================
  Files         191      192       +1     
  Lines       37407    37463      +56     
  Branches     3489     3496       +7     
==========================================
+ Hits        36032    36094      +62     
+ Misses       1375     1369       -6     

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[mrgrain]

@Mergifyio update

[mergify]

update

☑️ Nothing to do

• #commits-behind>0 [📌 update requirement]
• -closed [📌 update requirement]
• -conflict [📌 update requirement]
• queue-position=-1 [📌 update requirement]